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What causes 'noisy' DVD tracking?

Discussion in 'Electronic Repair' started by Robert Macy, Apr 7, 2009.

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  1. Robert Macy

    Robert Macy Guest

    This is the cheapest DVD player on the market, from Samsung, under the
    label GO Video

    Some DVD's it sounds like gravel grinding away. Often louder than the
    soundtrack. Sometimes no noise, sometimes awful.

    Question:
    What is this sound? stepper motor trying to track? or what?
    plus, as with most noises, does this mean the life of the unit is
    being shortened?

    Robert
     
  2. Is the disk actually playing correctly? It's possible to misload them and
    get some odd noises.
     
  3. Arfa Daily

    Arfa Daily Guest

    Usually, it is the lens suspension 'singing' that kicks up tracking noise.
    The focus and tracking motors are just coils that operate in a magnetic
    field to move the lens up and down (focus) and side to side (tracking) and
    are thus like a tiny 'loudspeaker'. If the lens is being driven by a
    'scruffy' tracking or focus signal, the usual result is the audible whistle
    / hiss / grinding noise, which can be quite loud, but I would stop short of
    saying that I have ever heard it louder than the soundtrack, except where it
    is just quiet dialogue. The normal cause of a scruffy signal, is a marked,
    scuffed or scratched disc, but there are some automatic servo gain control
    faults that can cause similar symptoms. Have you checked any discs that are
    affected to make sure that they are clean / undamaged ? Are the same discs
    always affected in the same way ? When doing it, are they playing 'normally'
    in terms of picture and sound ?

    It is also possible to get loading problems which can cause a disc to
    mechanically drag on the edge of the tray, and also to get partially
    collapsed deck suspension rubbers or springs, which can cause intermittent
    mechanical drag issues. Because DVD discs rotate at such high speed, even a
    slight drag makes a lot of noise, but will often allow the disc to play
    normally. If you can catch it doing it, and whip the lid off to take a look,
    it should be obvious if it is a mechanical issue, unless it's one of those
    machines that uses a computer-style drive, that's fully covered in ...

    Arfa
     
  4. Robert Macy

    Robert Macy Guest

    Thank you for your detailed reply.

    It is a NEW never previously viewed DVD. It plays normally. But, I
    never verified proper loading. It has been ejected and reinserted
    with little change. I don't think I can get the lid off this unit
    easily.

    From your description it would seem possible that the tracking on this
    machine is set in one operational norm and the tracking for 'general'
    DVD is somewhere else. So that when this machine plays such a
    standard disc the machine complains. Makes sense.

    I guess the solution is to put the machnie in a box, in a cupboard,
    under a blanket. Except the remote then has difficulty.

    Robert
     
  5. Arfa Daily

    Arfa Daily Guest

    Thank you for your detailed reply.

    It is a NEW never previously viewed DVD. It plays normally. But, I
    never verified proper loading. It has been ejected and reinserted
    with little change. I don't think I can get the lid off this unit
    easily.

    From your description it would seem possible that the tracking on this
    machine is set in one operational norm and the tracking for 'general'
    DVD is somewhere else. So that when this machine plays such a
    standard disc the machine complains. Makes sense.

    I guess the solution is to put the machnie in a box, in a cupboard,
    under a blanket. Except the remote then has difficulty.

    Robert

    A new disc doing it would seem to eliminate surface damage as the cause, and
    the fact that any given disc which does it, continues to do it even after
    multiple re-load attempts, would probably eliminate mechanical issues due to
    misloading. Sometimes, you just never get to the bottom of what causes some
    discs to misbehave in some machines - it's just one of those things. Another
    slight possibility is that the boss in the centre of the turntable, might be
    right at the top of its moulding tolerance. If you then get a disc which has
    a hole right at the bottom of its size tolerance, you can get a situation
    where the disc will not sit quite flat on the turntable. This can cause the
    disc to run with a slight wobble which is enough to make it catch on the
    tray, but still within the limits of what the focus servo can handle, so it
    still plays ok.

    Arfa
     
  6. Lynn

    Lynn Guest

    I think I know what that sound is. I got this DVD where some bitch
    pulls out a gun on someone so some dude pulls out a chainsaw from the
    back of his car and saw off the bitches arm and you see the arm fall
    to the ground still holding the gat and the bitch tried to swing at
    the chainsaw dude with half an arm and then she starts running away
    and the chainsaw dude catches up with her and saws off half her leg
    and after that he started sawing her pussy and started cutting up her
    torso and then her chest up to her head and then the bitch was lying
    on the ground in half. So, I think you might have been watching a
    horror film with lots of chainsaws.
     
  7. Robert Macy

    Robert Macy Guest

    great october 31 st story

    any list of 'best' DVD drives around?

    The ones that work well, reliably for long times?
     
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